Generally speaking, in anticorrosive systems, we use 2 things :
- the sacrifice of components such as zinc,
- the barrier properties of crosslinked thermosets.

In practice, zinc is incorporated either as a powder of pure zinc or as zinc
phosphate or zinc oxide, just to mention few.
Sometimes, when harsh conditions are met, "zinc rich primers" are used,
where zinc content is above 92% w/w on dry matter.
Otherwise, smaller amounts are prefered and we add additives such as zinc
phosphates.
The media is, in the vast majority of cases, a two-component epoxy.
Once resin and hardener have crosslinked into a tough thermoset, the
shielding is good, which prevents moisture and air to go through the coating
onto the substrate. That's why zinc components are never completely ruined.
Depending on the corrosiveness of the atmosphere, we adjust the thickness of
the system, and we advise our customers to a 2- or 3-coat system, with
generally :
- an epoxy primer or ground coat,
- a thickness coat (often an epoxy, as well),
- a finish (often a polyurethane, because epoxies behave very bad outdoors,
with a lot of chalking for example)
In France, we have an association called ACQPA for the certification of the
coating systems, applicators, and controllers.
If you need further explanations, don't hesitate to contact me :
Nicolas DELFAU
R&D Manager
Peintures SOB
FRANCE
delfau.nicolas@peintures-sob.fr

Perhaps someone can assist me. What are the 'active' components in an ion
generating anti-corrosion system? Obviously there is a reference cell, but
what are the other components?
Thank you very much for your help.
Rick

Perhaps someone can assist me. What are the 'active' components in an ion
generating anti-corrosion system? Obviously there is a reference cell, but
what are the other components?
Thank you very much for your help with this.
Rick